Syringe.



' W. W. LARSSEN.y

SYRINGE.

APPLICATION FILED Aucme, I9I5.

Patented May 30, 1916.

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IIIMIQYUI VVITNESSES:

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WILLIAM. W. LARSSEN, OF SAN FRANCISCO, CALIFORNIA,

SYRINGE.

Specification of Letters Patent.

Patented May 30, 1916.

Application filed August 16, 1915. Serial No. 45,756.

To all whom it may concern p Be it known that I, WILLIAM W. LAiissnN, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Tmprovements in Syringes, of which the following is a specification.

This invention relates to a syringe.

One of the objects of the present invention is to provide a simple, substantial, easily assembled form of return flow syringe particularly constructed to permit the water or other liquid employed to be more efficiently applied, and also to permit a more free escape of the return flow or discharge.

Another object of the invention is to provide means for varying the flow or pressure of the liquid passing through the syringe.

Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as will -hereinafter be more fully described and claimed, having reference to the accompanying drawings, in which- Figure 1 is the plan view of the syringe. Fig. 2 is a vertical longitudinal section through same. Fig. 3 is a perspective view of the discharge nozzle. Fig. 4 is a side elevation of the syringe, showing it connected with the source of liquid supply.

Referring to the drawings in detail A indicates the syringe tube, one end of which is provided with the discharge nozzle, generally indicated at 3. The opposite end of tube A is provided with a closure or cap 4, which is provided with two nipple extensions 5 and 6, nipple 5 being connected with the source of liquid supply, as a tank, 7, hot water bag or similar means by a hose or tube connection 8; while nipple 6 is provided with an extension tube 9 which may connect with a receptacle of any suitable nature not here shown. Nipple 6 is provided with an opening 10 which communicates with the interior of the main tube A, while nipple 5 communicates with an inner tube 11 which is formed integral with or otherwise secured to the closure or cap 4. The opposite end of the inner tube is sufficiently long to extend a slight distance beyond the opposite end of the main tube and is threaded to permit the discharge nozzle 3 to be screwed thereon, as indicate at 12. The inner flange of cap 4 is preferably tapered as at 13 to form a tight water-proof joint with the main tube,which is similarly tapered. The application of the discharge nozzle will in this manner draw the cap 4 into position and secure it thereon sufficiently tight to prevent leakage. This takes place when the discharge nozzle has been screwed down on the outer end of the main tube until it assumes a position where it engages with the end of the main tube as indicated at 14. The discharge nozzle forms one of the important features of the present invention and is constructed as follows: First, it is tapered in construction, see Figs. l, 2 and 3. Second, it is provided with an interior chamber 15 and a plurality of discharge openings 16. Third, its exterior surface is provided with a plurality of grooves 17, the inner ends of which communicate with the interior of the main tube to form passages through which the return flow is permitted to escape. The nozzle in this manner only forms a partial closure for the outer end of the main tube. The grooves 17 form openings through which the return flow is admitted to the tube and finally discharged through nipple 6 and the connected hose 9, while the large lugs on the inner end of the nozzle indicated at 18 form supports for the nozzle, which engages the main tube as at 14.

Another important feature of the present invention is the provision of means whereby the velocity and pressure of the liquid passing through the discharge nozzle and syringe proper may be increased or decreased at the will of the operator. This is accomplished in the following manner: Interposed on the tube or hose 8 between the syringe and the source of supply is a bypass tube 19, on which is mounted a coinpression bulb 20, which is provided at each end with a check valve 21 provided for the purpose of preventing iiow through the compression bulb except in the direction of arrow a. If when the syringe is being used it is desired to increase or decrease the flow or pressure of the liquid passing through the syringe it is only necessary to alternately or intermittently press the bulb 20. This will either cause the bulb to charge or discharge liquid through the connected bypass tube, and force this, together with the normal flow passing through the main tube 8 through the syringe and nozzle, in this manner increasing or decreasing the flow and pressure of the discharging liquid.

A syringe constructed as here shown is not only simple and compact but its construction permits it to be quickly assembled or taken apart for use or for sterilization of same.

The syringe is particularly constructed for insertion into the abdominal cavities or discharge passages of the human body. The connections formed between the syringe and the source of water or other liquid supply permits aV continuous circulation of a large volume of the liquid to every partV of the cavity treated. The variable iiow, or alternationsr from high to low pressure of the liquids is of greatimportance as it causes contraction and expansion of the mucous membranes or the walls of the cavity. It furthermore produces a scrubbing and niassaging effect which not only causes a thorough cleansing but also circulation of blood in the surrounding tissue, in this manner alleviating and often curing diseases of parts treated.

The materials and finish of the several parts of the devices vare such as the experi` ence and judgment of the manufacturer may dictate. e Y

I wish it understood that various changes in form, proportions and minor details of construction may be resorted toV within the scope of the appended claims, and that I do not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and desire to` secure byV Letters Patent is:y

1. In a syringe, va vmain outer tube, a cap,

an inner tube in the outer tube integral with iand extending on opposite sides of said cap,

'said cap conformably receiving one end of the outer tube, a discharge nozzle threaded over one end of the inner tube, said nozzle having spaced lugs on its inner end formed so as to project within the other end of thc outer tube and to also abut the edge of the other end of the outer tube, said nozzle be'- ing formed with longitudinal grooves diS- posed between the lugs, and a nipple integral with the end wall of the cap and said cap end wall having a perforation which establishes communication between the nipple and the outer tube.

2. In a syringe, an inner and an outer tube, and a nozzle connected to one end of the inner tube and being formed at its inner end to directly abut the inner circumference of the outer tube at one end thereof and to abut the outer edge of said end of the outer tube whereby to support the nozzle, said nozzle having a series of longitudinal grooves which extend through its inner end so as to discharge matter into the outer tube.

3. In a syringe, an inner tube, a cap thereon, an outer tube having one end received in the cap, and a nozzle threaded on the outer end of the inner tube and having spaced lugs which abut the other end of the outer tube to force the latter into engagewitnesses.

- WILLIAM W. LARSSEN., Witnesses JOHN H. I-IERRING, O. A. EGGERS.

Copies of this patent maybe obtained for ve cents each, by addressing the Commissioner of Patenti.

v u Washington, D. C. 

